JP2019021406A - Reed switch control method, reed switch control device, and push button switch - Google Patents

Abstract

To ensure on/off operation of a push button switch using a reed switch, and also to shorten a movement stroke of a magnet.SOLUTION: A magnet pair comprising a magnet 4 and a magnet 42 is moved in a Z-direction by a push button so that an electrode 21 is magnetized by the main magnet 4, thereby generating a magnetic flux flow in a gap 23 between the electrode 21 and an electrode 22. Both electrodes are brought into contact-conduction with each other by magnetic attraction so that a reed switch 2 is turned on. This causes the magnet 4 to separate from the electrode 21, thereby reducing the magnetization of the electrode 21. Then, the auxiliary magnet 42 magnetizes the electrode 22 into the same polarity of that of the electrode 21. This reduces the magnetic flux flow to decrease the magnetic attraction between both electrodes. As a result, by bringing both electrodes 21 and 22 into an open non-conductive state, the reed switch 2 may be turned off with a shorter stroke.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reed switch control system for controlling on / off driving of a reed switch, a reed switch control apparatus for controlling on / off driving of a reed switch based on this system, and a press equipped with the reed switch control apparatus. It relates to button switches.

  For trains and trains with few passengers, the doors are left open unnecessarily for a long time when the train is stopped at the station. In order to prevent the temperature inside the vehicle from rising, there are those equipped with semi-automatic doors that can be opened and closed by passengers themselves.

  In the vehicle as described above, push button switches are installed as door opening / closing switches on the vehicle exterior side and the vehicle interior side of the door accommodating portion.

  A conventional push button switch of this type is shown in FIG. In FIG. 6, x, y, and z represent the X axis, Y axis, and Z axis in the three-dimensional orthogonal coordinate system. This three-dimensional orthogonal coordinate system is common to the drawings.

  The push button switch shown in FIG. 6 includes a reed switch 2 that is fixedly provided in a casing (not shown) and a push button 3 that can be moved into and out of the casing, and the reed switch 2 side of the push button 3. A magnet 4 for driving the reed switch 2 is attached to the surface portion. In this push button switch, the reed switch 2 constitutes the contact portion.

  In this push button switch, as the push button 3 is operated, the opposing electrodes of the reed switch 2 are magnetized by the magnet 4, and the opposing electrodes are made conductive by the magnetic attractive force generated by the magnetic flux generated between the electrodes of the reed switch 2. The reed switch 2 is turned on / off as non-conduction.

  In the push button switch of FIG. 6, the direction of the magnetic pole axis of the magnet 4 is set in the y direction orthogonal to the direction x (which is also the length direction) of the electrode axis of the reed switch 2. One of the N pole and S pole on the shaft faces the reed switch 2 side.

  In the push button switch having the above configuration, the contact part is the reed switch 2 as described above, so that it can be used at a relatively high voltage and can be easily installed in a vehicle such as a train. Since the reed switch 2 is located beside the displacement path in the operation direction indicated by the arrow of the push button 3, the total thickness is reduced to the thickness obtained by adding the displacement stroke to the depth length of the push button 3. There are advantages such as being able to.

JP 2001-184993 A

  As described above, when the reed switch control device is constituted by the reed switch 2 and the magnet 4, there is room for improvement in the action of the magnet 4 on the reed switch 2, and the on / off operation reliability of the reed switch 2 is certain. It is desirable to further shorten the moving stroke of the magnet 4 without impairing the movement.

  The operation and problems of the conventional reed switch control device will be described below.

  The arrangement of the reed switch 2 and the magnet 4 in the conventional reed switch control device is as shown in the arrangement diagram of FIG. FIG. 7A is a plan view, and FIG. 7B is a side view. In these drawings, the electrode axis direction of the reed switch 2 is the x direction, the magnetic pole direction of the magnet 4 is set to the y direction, and the magnet 4 moves in the z direction. In FIG. 7A, the Z-axis penetrates the paper surface, and in FIG. 7B, the X-axis penetrates the paper surface.

  The magnetizing force of the magnet 4 with respect to the reed switch 2 will be described with reference to FIGS. 7 (a) and 7 (b) and FIG. FIG. 8 is a characteristic diagram showing the strength of the magnetizing force of the magnet 4 with respect to the reed switch 2 in the conventional push button switch. In FIG. 8, the horizontal axis represents the position on the Z axis of the magnet 4, and the vertical axis represents the magnetizing force of the magnet 4 on the electrode of the reed switch 2.

  When the magnet 4 is pushed by the push button 3 and moved from the position indicated by the broken line 4 ′ to the position z = 0 indicated by the solid line as shown in FIG. 7B, the magnet 4 is closest to the reed switch 2. As shown in FIG. 8, the magnetizing force of the magnet 4 on the reed switch 2 is maximized.

  In the position where the magnet 4 is on both sides of z = 0, the magnetizing force on the reed switch 2 gradually decreases as the position of the magnet 4 increases or decreases from the position of z = 0, and the position of the magnet 4 is z = 0. At a position far away from the position, the magnetizing force on the reed switch 2 is equal to or less than the magnetizing force at which the reed switch 2 is turned on (hereinafter referred to as “on magnetizing force”). Or less (hereinafter referred to as “off-magnetization force”).

  The reed switch 2 is turned off at a position where the magnet 4 moves in the z direction with respect to the reed switch 2 and the magnetizing force thereof falls below the off magnetizing force of the reed switch. When the magnet 4 moves toward the position z = 0 on the Z axis, the reed switch 2 is turned on at a position where the magnetizing force is equal to or greater than the on magnetizing force.

  Therefore, with respect to the reed switch 2, the magnet 4 moves at least from a position where the magnetizing force exceeds the on-magnetizing force (for example, −4 <z) to a position below the off-magnetizing force (for example, z <−7). Thus, the reed switch 2 is turned on / off.

  However, at the positions on both sides of the magnet 4 at z = 0, the magnetizing force gradually decreases as described above, so that the magnet 4 moves from a position where the magnetizing force exceeds the on-magnetizing force to below the off-magnetizing force. In order to increase the distance and turn the reed switch 2 on and off, it is necessary to move the magnet 4 with a longer stroke with respect to the reed switch 2, and the reed switch control device and the push button switch equipped therewith are made thinner. There is a limit.

  The present invention has been made in order to solve the above-mentioned problems. While the magnet is used as a main magnet, an auxiliary magnet is provided on the magnet, and the magnetizing force on the electrode of the reed switch is set at a position z = 0. The distance between the magnet pair from the position where the magnetizing force exceeds the on-magnetizing force to the point where it falls below the off-magnetizing force is shortened, thereby reducing the moving stroke of the magnet pair relative to the reed switch. The purpose is to shorten the length of the lead switch control device and the push button switch including the same.

To solve the above problem,
(1) In the reed switch control system of the present invention, the reed switch having the first and second electrodes facing each other is turned on / off based on conduction by contact of the electrodes and non-conduction by opening. In the reed switch control system that controls the drive,
While the first magnet is brought close to the first electrode, the second magnet is separated from the second electrode, and the magnetizing force of the first electrode by the first magnet and the second magnet The reed switch is turned on by driving the reed switch by creating a flow of the magnetic flux in the gap between the two electrodes by the difference from the magnetizing force of the second electrode by the magnet of
While the first magnet is separated from the first electrode, the second magnet is moved closer to the second electrode, and the magnetizing force of the first electrode by the first magnet is The reed switch is driven and controlled to be reduced by reducing the flow of the magnetic flux based on the difference from the magnetizing force of the second electrode by the second auxiliary magnet.

  According to the present invention, with the first magnet as a main magnet, the first electrode is magnetized to create a flow of magnetic flux in the gap between the two electrodes, and the two electrodes are magnetically attracted to conduct. The reed switch is turned on to weaken the magnetization of the first electrode, and the second magnet is used as an auxiliary magnet to magnetize the second electrode to the same polarity as the first electrode to reduce the flow of the magnetic flux. By doing so, the magnetic attraction force is weakened, and both the electrodes are made non-conductive and the reed switch can be driven off.

  That is, according to the present invention, instead of magnetizing the electrode of the reed switch with only one magnet as in the prior art, the first electrode is magnetized with the main magnet and the reed switch is driven and controlled. In addition, since the second electrode is magnetized to the same polarity as the first electrode by the auxiliary magnet, control is performed so that the difference in magnetization force with respect to the electrode of the reed switch can be sharply reduced when the position z = 0. be able to. As a result, the moving distance of the magnet pair by the main magnet and the auxiliary magnet from the position where the difference in magnetizing force exceeds the on-magnetizing force to below the off-magnetizing force is shortened, thereby shortening the moving stroke of the magnet with respect to the reed switch. In addition, it is possible to reduce the thickness of the reed switch control device and the push button switch including the reed switch control device.

  The above operation will be described in more detail. The magnetic flux is generated in the gap between the two electrodes of the reed switch due to the difference in the magnetizing force exerted on the two electrodes. In the conventional method of controlling the reed switch on / off by operating the main magnet only on the first electrode, the second electrode is always set to magnetization 0, so the difference in magnetization force is equal to the magnetization force of the main magnet. If the magnetizing force of the auxiliary magnet is applied to the second electrode in the same polarity as the first electrode and the strength is controlled simultaneously with the main magnet, it becomes easy to obtain a preferable control characteristic.

  From the above, the present invention obtains a steep change in the difference in magnetization force accompanying the movement of the magnet pair by the auxiliary magnet.

(2) A reed switch control device according to the present invention includes first and second electrodes facing each other, and an electrode shaft including both electrodes in a three-dimensional orthogonal coordinate system including an X axis, a Y axis, and a Z axis. In a reed switch control device for controlling on / off driving of the reed switch based on conduction and release by contact of the two electrodes with respect to the reed switch parallel to the X axis,
A main magnet that is movable in parallel to the Z-axis, whose magnetic pole axis is parallel to the Y-axis, and whose one magnetic pole faces the first electrode at a first distance in the y direction;
The main magnet and the magnet pair can move integrally in the z direction, the magnetic pole axis thereof is parallel to the Y axis, and the magnetic pole having the same polarity as the one magnetic pole is the y electrode with respect to the second electrode. An auxiliary magnet facing away from the direction by a second distance;
With
While the main magnet is brought close to the first electrode, the auxiliary magnet is separated from the second electrode, the magnetizing force of the first electrode by the main magnet and the second electrode by the auxiliary magnet. Create a flow of the magnetic flux in the gap between the electrodes due to the difference with the magnetizing force, and drive-control the lead switch on,
While the main magnet is separated from the first electrode, the auxiliary magnet is brought close to the second electrode, the magnetizing force of the first electrode by the main magnet and the second electrode by the auxiliary magnet. The reed switch is driven and controlled to be off by reducing the flow of the magnetic flux based on the difference from the magnetizing force.

  In the present invention, when the reed switch is driven on, the main magnet is brought close to the first electrode of the reed switch to magnetize the first electrode, and the first electrode and the second electrode The magnetic flux is generated in the gap between the two electrodes due to the difference in magnetization strength between the two electrodes and a magnetic attractive force is generated between the two electrodes. When driving the reed switch off, the main magnet is moved away from the first electrode to weaken the magnetization with respect to the first electrode, and at the same time, the auxiliary magnet is moved closer to the second electrode to bring the first magnet closer to the first electrode. By magnetizing the second electrode with the same polarity as the first electrode, the difference in magnetization between the two electrodes is reduced or reversed, and the flow of magnetic flux in the gap between the two electrodes is reduced or reversed.

  In the present invention, when the magnet pair composed of the main magnet and the auxiliary magnet is moved in the z direction, the difference in the magnetizing force with respect to the electrode of the reed switch is obtained on both sides of the position z = 0 on the Z axis. As a result, the moving distance of the magnet pair in the Z direction from the position where the difference in magnetizing force exceeds the on-magnetizing force to below the off-magnetizing force is shortened. The moving stroke can be shortened to reduce the thickness of the reed switch control device and the push button switch including the reed switch control device.

  In addition, in the present invention, when the flow of magnetic flux in the gap between the two electrodes is reversed, the magnetic flux always passes through the state of zero magnetic flux, so the phenomenon that the magnetic attractive force becomes zero and the reed switch is surely turned off is applied. Thus, the stroke of the push button attached to the magnet moving means can be reduced.

  Also from this point, the moving stroke of the magnet for driving the reed switch on and off can be shortened, and the reed switch control device and the push button switch including the reed switch can be made thinner.

  Further, in the present invention, a ferromagnetic auxiliary magnetic pole body is disposed between the auxiliary magnet and the reed switch, and the magnetic force exerted by the auxiliary magnetic pole body on the second electrode of the reed switch by the auxiliary magnetic pole body. There is an embodiment in which is adjusted to a predetermined value.

  In addition, in the present invention, the first reed switch and the second reed switch sandwich the first magnet and the second magnet from both sides in the y direction, and the electrodes of the first reed switch. An axis and an electrode axis of the second reed switch are arranged in parallel with the X axis, and the first reed switch is mainly turned on and off by the first magnet, and the second reed switch The on / off drive of the switch is mainly performed by the second magnet, and the first reed switch and the first magnet with respect to the movement of the pair of the first magnet and the second magnet When the first reed switch is driven on or off, the second reed switch moves toward and away from the second reed switch and the second magnet approaches and separates. Switch off or on There is an embodiment in which each is driven. In this case, the first magnet is the main magnet and the second magnet is the auxiliary magnet with respect to the first reed switch, and the second magnet is the main magnet and the first magnet with respect to the second reed switch. Becomes an auxiliary magnet.

  In these embodiments of the present invention, the a / b contact switch is simple in construction and can be manufactured at low cost. In the embodiment of the present invention, when applied to a push button switch, the stroke of the push button required for turning on and off the reed switch can be reduced. It can be configured so that operations do not overlap.

  In the present invention, measures are taken such as increasing the minimum distance from the second electrode of the reed switch or using a magnet with weak magnetizing force so that the auxiliary switch alone does not drive the reed switch on. The operation may be stabilized by reducing the magnetizing force. Further, in the present invention, when it is difficult to freely set the positions of the main magnet and the auxiliary magnet on the Y axis, an auxiliary magnetic pole body, for example, an appropriately shaped pole piece is provided on the reed switch side of the auxiliary magnet. By arranging, the magnetizing force of the auxiliary magnet may be adjusted to a predetermined value.

  Furthermore, in the present invention, the magnetization of the second electrode of the reed switch by the main magnet cancels the gap magnetic flux generated by the main magnet, so that the magnetic attraction force of the gap between the first electrode and the second electrode is rapidly reduced. Thus, the moving distance of the magnet pair for switching on / off of the reed switch can be remarkably reduced. Therefore, in the push button switch provided with the reed switch control device of the present invention, the stroke of the push button can be remarkably reduced.

  In addition, in the present invention, the reed switch is the first reed switch, and the second reed switch is disposed on the second magnet side across the first and second magnets from the first reed switch, When the second reed switch is operated with the second magnet as the main magnet and the first magnet as the auxiliary magnet, the on / off driving operation of the first and second reed switches is symmetrical with respect to the movement of the magnet pair. Thus, a switch with a and b contacts can be configured. When the auxiliary magnetic pole body is used, the auxiliary magnetic pole body is added to both the first and second magnets.

  (3) A push button switch according to the present invention is a push button switch including any one of the above-described reed switch control devices, and as a means for moving at least the first and second magnet pairs, a protrusion / displacement relative to the casing. It has the push button provided freely, It is characterized by the above-mentioned.

  According to the present invention, since the reed switch control device is used, the push button switch using the reed switch control device can be thinned.

  According to the reed switch control system of the present invention, since the magnet used for the magnetization of the reed switch electrode can be moved by a short distance, the magnetizing force acting on the reed switch can be greatly increased or decreased. By shortening, it is possible to reduce the thickness of the reed switch control device based on this method and the push button switch including the reed switch control device.

  Further, according to the reed switch control device of the present invention, when the position of the magnet moves away from the position z = 0 on the Z-axis, the difference in the magnetizing force with respect to the electrode of the reed switch decreases sharply, The moving distance of the magnet in the Z direction from the position where the difference exceeds the on-magnetizing force level to below the off-magnetizing force level is shortened, thereby shortening the moving stroke of the magnet with respect to the reed switch and reducing the thickness of the reed switch control device. Can be planned.

  According to the push button switch of the present invention, since the reed switch control device is used, the thickness can be reduced.

The positional relationship of the reed switch and magnet which concern on the 1st Embodiment of this invention is shown, (a) is the top view, (b) is the side view. The characteristic view which shows the strength of the magnetizing force with respect to the reed switch of the magnet in the positional relationship of FIG. The positional relationship of the reed switch which concerns on the 2nd Embodiment of this invention, a magnet, and a pole piece is shown, (a) is the top view, (b) is the side view. The positional relationship of the 1st reed switch which concerns on the 3rd Embodiment of this invention, a 2nd reed switch, and a magnet is shown, (a) is the top view, (b) is the side view. The positional relationship of the reed switch which concerns on the 4th Embodiment of this invention, a magnet, and a pole piece is shown, (a) is the top view, (b1) is the state where the reed switch 2 is off and the reed switch 12 is on. (B2) is a side view in a state where the reed switch 2 is on and the reed switch 12 is off. It is a schematic perspective view of the conventional pushbutton switch. The arrangement | positioning figure of the magnet and reed switch of the conventional pushbutton switch is shown, (a) is the top view, (b) is the side view. It is a characteristic view which shows the strength of the magnetizing force with respect to the reed switch of the magnet of the conventional pushbutton switch.

  Hereinafter, a reed switch control system, a reed switch control device, and a push button switch according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 shows a first embodiment of the present invention. 1A and 1B show a positional relationship between a reed switch and a magnet according to the first embodiment, wherein FIG. 1A is a plan view and FIG. 1B is a side view thereof.

  The push button switch according to the first embodiment includes a push button (not shown) and a casing (not shown) in which the push button appears and disappears. Although not particularly illustrated, the push button is configured to go in and out of the casing by a push operation in the z direction or a release operation of the push operation.

  In the first embodiment, a main magnet 4 as a first magnet and an auxiliary magnet 42 as a second magnet are provided. These main and auxiliary magnet pairs are attached to appropriate magnet moving means (not shown) and connected to push buttons.

  The main magnet 4 is the same as a conventional magnet, while the auxiliary magnet 42 constitutes an auxiliary magnet that is characterized in the first embodiment with respect to the main magnet. The main magnet 4 and the auxiliary magnet 42 can be moved together in the Z direction by a magnet moving means (not shown) in accordance with the operation of the push button.

  When the electrode axis of the reed switch 2 is fixed in the casing parallel to the x-axis and the push button moves in and out of the casing by the operation, the main magnet 4 and the auxiliary magnet 42 are constant in the z direction in the casing. Both move together in the z direction while maintaining the interval.

  The electrode axis of the reed switch 2 is composed of first and second electrodes 21 and 22, and when the reed switch 2 is off, a gap 23 is interposed between the electrodes 21 and 22, and both the electrodes 21 and 22 are When the reed switch 2 is in an on state, the electrodes 21 and 22 are electrically connected by contact.

  The main magnet 4 has a magnetic pole axis composed of an N pole and an S pole, and this magnetic pole axis is parallel to the Y axis. The main magnet 4 moves in the z direction with its magnetic pole axis kept parallel to the Y axis. The north pole of the main magnet 4 faces the reed switch 2 on the lower side in the y direction, and the south pole is on the upper side in the y direction.

  The magnetic pole axis of the auxiliary magnet 42 is parallel to the Y axis similarly to the main magnet 4 and moves in the z direction integrally with the main magnet 4. The N pole of the auxiliary magnet 42 faces the reed switch 2 and has the same polarity as the main magnet 4.

  The position of the main magnet 4 on the Y axis is y1, and the position of the auxiliary magnet 42 on the Y axis is y2, and y1 <y2. Thereby, the magnetizing force exerted on the reed switch 2 of the auxiliary magnet 42 is smaller than the magnetizing force of the main magnet 4.

  Further, regarding the positions of the main magnet 4 and the auxiliary magnet 42 on the Z axis, when the reed switch 2 is on, the main magnet 4 faces the reed switch 2 almost on the Z axis, whereas the reed switch 2 In an off state, the auxiliary magnet 42 is arranged so as to face the reed switch 2 substantially on the Z axis.

  In FIG. 1B, the position of the magnet with the reed switch 2 turned on is indicated by a solid line, and the position of the magnet with the reed switch 2 turned off is indicated by a dotted line.

  When the reed switch 2 is on and the main magnet 4 is at the position of z = 0 on the Z axis as shown in FIG. 1B, the auxiliary magnet 42 moves to the right from the position of z = 0. In a remote location. In the state where the reed switch 2 is OFF, the main magnet 4 is moved to the left from the position of z = 0 as in 4 ′, and the auxiliary magnet 42 is positioned at approximately z = 0 as in 42 ′.

  The main magnet 4 magnetizes one of the two electrodes 21, 22 of the reed switch 2 to the north pole, while the auxiliary magnet 42 controls the other second electrode 22 to the first electrode 21. Magnetized to the N pole having the same polarity as the electrode 21, the magnetic flux passes through the gap 23 between the two electrodes 21, 22 according to the difference in the magnetization strength of the two electrodes 21, 22, and both according to the amount of the passing magnetic flux The magnetic attractive force between the electrodes 21 and 22 changes.

  The reed switch 2 is turned on when the first electrode 21 and the second electrode 22 come into contact with each other when the magnetic attractive force is strong, and when the magnetic attractive force is weak, the reed switch 2 is turned on. When the electrode 22 is opened and becomes non-conductive, it is driven off.

  The arrangement and moving direction of the main magnet 4 and the auxiliary magnet 42 with respect to the reed switch 2 will be described in more detail below.

  As described above, in FIG. 1, the electrode axis of the reed switch 2 is parallel to the X axis, and the main magnet 4 and the auxiliary magnet 42 move together in parallel to the Z axis. The magnetic pole axes of the main magnet 4 and the auxiliary magnet 42 are parallel to the Y axis as described above, and the positions of the main magnet 4 and the auxiliary magnet 42 on the Y axis are y1 and y2, respectively. Each moves at a constant interval in the z direction.

  When the push button is in the return position (non-operating position), the main magnet 4 is at a position 4 ′ away from the z = 0 position where the reed switch 2 is located, as shown by the dotted line in FIG. The auxiliary magnet 42 is located at a position 42 ′ close to the reed switch 2. In this state, since the magnetizing force acting on the reed switch 2 of the auxiliary magnet 42 is weak, the reed switch 2 is off.

  When the main magnet 4 moves from the position 4 ′ on the Z-axis to the position closest to the reed switch 2 (z = 0) as the push button is pressed, the main magnet 4 moves to that position (z = 0). The magnetizing force acting on the reed switch 2 suddenly increases to the on magnetizing force, the reed switch 2 switches from off to on, and the main magnet 4 is closest to the reed switch 2 (z = 0). ) To keep the reed switch 2 on.

  This operation will be described in more detail with reference to FIG. 2 together with FIG. FIG. 2 shows the magnetization force acting on the reed switch 2 when the magnet pair of the main magnet 4 and the auxiliary magnet 42 is moved in the z direction. The horizontal axis of FIG. 2 represents the position of the magnet pair, represented by the position of the main magnet 4, and the position when the main magnet 4 is closest to the reed switch 2 is z = 0. The vertical axis represents the magnetizing force.

  In this example, the auxiliary magnet 42 is disposed at a position larger by +10 on the Z-axis than the main magnet 4. Therefore, the auxiliary magnet 42 comes closest to the reed switch 2 when the main magnet 2 is at z = −10.

  The difference in magnetizing force exerted on the magnetic flux (gap magnetic flux) in the gap 23 between the electrodes 21 and 22 of the reed switch 2 is that the main magnet 4 and the auxiliary magnet 42 are each independently of the first electrode 21 and the second electrode 22. This is the difference in magnetizing force for magnetizing.

  In FIG. 2, the magnetizing force of the main magnet 4 is indicated by A, the magnetizing force of the auxiliary magnet 42 is indicated by B, and C indicates the difference between the magnetizing forces A and B. The gap magnetic flux is generated by the difference C between the two magnetizing forces of the main magnet 4 and the auxiliary magnet 42. The magnetizing force difference C (-) indicates that the direction of the gap magnetic flux is reversed.

  As shown in FIG. 2, the difference C between the magnetization force A of the main magnet 4 and the magnetization force B of the auxiliary magnet 42 changes more rapidly than the magnetization force A of the single main magnet 4.

  As a result, when the position z on the Z-axis of the magnet pair increases, the difference C in the magnetizing force increases from z = -3 to the on-magnetizing force, and the reed switch 2 turns from off to on, and the position z decreases. At z = −5, the reed switch 2 is turned from on to off by decreasing to the off-magnetizing force.

  With the magnetizing force A of the main magnet 4 alone, the reed switch 2 is turned on when z = -4, and the reed switch 2 is turned off when z = -7. In contrast, when the auxiliary magnet 42 is present, the necessary amount of movement of the magnet is greatly reduced, and the maximum value of the difference C in the magnetizing force at z = 0 is the same as the magnetizing force A of the main magnet 4 alone. It is almost the same.

  Therefore, as shown in FIG. 2, for example, when the position on the Z axis is z = −7 to −1 as the operation stroke of the push button, the reed switch 2 is reliably turned on / off. The push button switch in this case is an a contact operation.

  From the above operation, in the first embodiment, the main magnet 4 mainly turns on the reed switch 2 as the main magnet, and the auxiliary magnet 42 acts as an auxiliary magnet to give a steep change in the difference in magnetizing force with respect to the reed switch 2. Yes.

  Further, the magnetizing force of the auxiliary magnet 42 needs to be an appropriate strength, and when a magnet having the same size and characteristics as the main magnet 4 is used as the auxiliary magnet 42, the separation distance in the y direction from the reed switch is appropriate. It is necessary to set a correct value.

[Second Embodiment]
FIG. 3 shows the positional relationship between the magnet and the reed switch in the second embodiment. 3A is a plan view thereof, and FIG. 3B is a side view thereof. FIGS. 3A and 3B correspond to FIGS. 1A and 1B, respectively, and corresponding portions are denoted by the same reference numerals.

  In the second embodiment, a ferromagnetic pole piece 52 as an auxiliary magnetic pole body is inserted between the auxiliary magnet 42 and the reed switch 2 in order to adjust the magnetization force of the auxiliary magnet 42. The pole piece 52 is fixed to the N pole side of the auxiliary magnet 42 and magnetized by the N pole of the auxiliary magnet 42, and is movable in the Z direction integrally with the auxiliary magnet 42.

  The auxiliary magnet 42 has the same shape and characteristics as the main magnet 4, the position on the Y-axis is fixed, and the magnetizing force applied to the reed switch 2 is adjusted by adjusting the length and cross-sectional area of the pole piece 52. Can be set to a value. Thereby, the freedom degree of design of a magnet moving means increases, and design becomes easy. In FIG. 3B, reference numeral 52 'denotes the pole piece 52 when the auxiliary magnet 42 is located at the position of the broken line 42'.

[Third Embodiment]
FIG. 4 shows the positional relationship between the magnet and the reed switch in the third embodiment. 4A is a plan view thereof, and FIG. 4B is a side view thereof. FIGS. 4A and 4B correspond to FIGS. 1A and 1B, respectively, and corresponding portions are the same. The code | symbol is attached | subjected.

  In the third embodiment, a second reed switch 12 is added to the first embodiment.

  The second reed switch 12 is placed on the side facing the S pole of the second magnet 42 in the Y direction, and the pair of the second magnet 42 and the second reed switch 12 includes the first magnet 4 and the second reed switch 12. The positional relationship is the same as that of the pair with 1 reed switch 2. The second reed switch 12 includes a first electrode 121 and a second electrode 122, and a gap 123 between the electrodes 121 and 122 is opened when the second reed switch 12 is off.

  In the Y direction, the first reed switch 2 and the second reed switch 12 are arranged side by side, and the first magnet 4 and the second magnet 42 are sandwiched between the reed switches 2 and 12. .

With respect to the first reed switch 2, the first magnet 4 is a main magnet whose N pole faces the first electrode 21, and the second magnet 42 is an auxiliary magnet whose N pole is the second electrode 22. Opposite to.
With respect to the second reed switch 12, the second magnet 42 is a main magnet whose S pole faces the first electrode 121, and the first magnet 4 is an auxiliary magnet whose S pole is the second electrode 122. Opposite to.

  The magnet pair is integrally moved in the z direction by the magnet moving means, and the first magnet 4 approaches the first and second reed switches 2 and 12 as indicated by the solid line in FIG. At this time, the second magnet 42 moves away from the first and second reed switches 2, 12. When the second magnet 42 approaches the first and second reed switches 2 and 12 at the position 42 ′ as shown by the dotted line in FIG. 4B, the first magnet 4 is at the position 4 ′. 1. Move away from the second reed switches 2 and 12. That is, when the main magnet approaches the first reed switch, the main magnet leaves the second reed switch, and when the main magnet approaches the second reed switch, the main magnet leaves the first reed switch.

  Due to the movement of the magnet pair by the magnet moving means, the on / off switching of the first reed switch 2 is opposite to the on / off switching of the second reed switch 12, and the lead of the a and b contacts can be easily read. A switch can be configured.

[Fourth Embodiment]
FIG. 5 relates to the fourth embodiment, and shows the positional relationship between a magnet, a pole piece as an auxiliary magnetic pole body, and a reed switch. The fourth embodiment is a second embodiment and a third embodiment. It is a combination of form. 5A is a plan view, FIG. 5B is a side view when the first reed switch 2 is off and the second reed switch 12 is on, and FIG. 5B is a first reed switch 2. FIG. 4 is a side view of when the second reed switch 12 is turned off and the second reed switch 12 is turned off.
The first electrodes 21 and 121 of the first reed switch 2 and the second reed switch 12; the second electrodes 22 and 122: and the gaps 23 and 123 correspond to FIG.

  In the fourth embodiment, similarly to the second embodiment, the pole piece 52 is fixed to the N pole of the second magnet 42 as an auxiliary magnetic pole body, and in addition, the second pole piece 5 is fixed to the first magnet. 4 is fixed to the S pole. A pole piece is attached to each auxiliary magnet. The pole piece 52 is magnetized to the north pole, and the second pole piece 5 is magnetized to the south pole.

  In the fourth embodiment, the first reed switch 2 is for the a contact and the second reed switch 12 is for the b contact. A first magnet 4 and a second magnet 42 and pole pieces 5 and 52 that can move in the direction are arranged.

  In the above configuration, when the push button is pushed in, the first reed switch 2 moves the main magnet 4 closer to the first electrode 21 of the first reed switch 2 as shown in FIG. The electrode 21 is magnetized to N polarity, and as a result, a magnetic attractive force is generated by the magnetic flux flowing through the gap 23 and is turned on. When the push button is returned, as shown in FIG. 5 (b1), the main magnet 4 is separated and the magnetization of the first electrode 21 of the first reed switch 2 is weakened. At the same time, the auxiliary magnet 42 and the pole piece 52 are When approaching, the second electrode 22 is magnetized to N having the same polarity as the first electrode 21, the flow of magnetic flux in the gap 23 is stopped, and the magnetic attractive force is lost and the second electrode 22 is turned off. Therefore, the operation of the first reed switch 2 becomes an a contact for pressing and returning of the push button.

  On the other hand, the operation of the second reed switch 12 is such that the main magnet 42 and the auxiliary magnet 4 move symmetrically with respect to the a contact of the first reed switch 2 with respect to pushing and returning of the push button, and b contact. It becomes.

  As described above, in the fourth embodiment, the first pole piece 5 is added to the first magnet 4, and the positions of the first magnet 4 and the second magnet 42 on the Y axis are not changed. The strength of magnetization applied to the second reed switch 12 of the magnet 4 is set to a predetermined value. In the fourth embodiment, the first and second reed switches 2 and 12 have symmetrical on / off operation characteristics with respect to the movement of the magnet pair by the magnet moving means. Can be configured.

2 1st reed switch 21 1st electrode 22 2nd electrode 23 Interelectrode gap 12 2nd reed switch 121 1st electrode 122 2nd electrode 123 Interelectrode gap 3 Push button 4 Main magnet 42 Auxiliary magnet 5 First pole piece 52 second pole piece

Claims (5)

In a reed switch control system for controlling on / off driving of the reed switch based on conduction and release by contact of both electrodes with respect to a reed switch having first and second electrodes facing each other,
While the first magnet is brought close to the first electrode, the second magnet is separated from the second electrode, and the magnetizing force of the first electrode by the first magnet and the second magnet A magnetic flux is generated in the gap between the two electrodes due to a difference from the magnetizing force of the second electrode by the magnet of the magnet, and the reed switch is driven and controlled.
While the first magnet is separated from the first electrode, the second magnet is moved closer to the second electrode, and the magnetizing force of the first electrode by the first magnet is The reed switch is driven and controlled to be reduced by reducing the flow of the magnetic flux by reducing the difference from the magnetizing force of the second electrode by the second magnet.
Reed switch control system characterized by this. A reed switch having first and second electrodes facing each other, and a direction of an electrode axis including both electrodes in a three-dimensional orthogonal coordinate system composed of an X axis, a Y axis, and a Z axis is parallel to the X axis. On the other hand, in a reed switch control device that controls on / off drive of the reed switch based on conduction by contact of both electrodes and non-conduction by opening,
A main magnet that is movable parallel to the Z-axis, whose magnetic pole axis is parallel to the Y-axis, and whose one magnetic pole faces the first electrode at a first distance in the y-direction. A magnet,
The main magnet can be moved in a z-direction as a magnet pair while maintaining a constant distance in the z direction, the magnetic pole axis is parallel to the Y axis, and the same magnetic pole as the one magnetic pole is the first magnetic pole. An auxiliary magnet that is a second magnet facing the second electrode at a second distance in the y direction;
With
The movement of the magnet pair brings the main magnet close to the first electrode, while the auxiliary magnet is moved away from the second electrode and the magnetizing force of the first electrode by the main magnet and the auxiliary magnet. The reed switch is turned on and controlled by creating a flow of the magnetic flux in the gap between the electrodes due to a difference with the magnetizing force of the second electrode,
The movement of the magnet pair in the opposite direction separates the main magnet from the first electrode, while bringing the auxiliary magnet close to the second electrode and the magnetizing force of the first electrode by the main magnet and the magnet The reed switch is driven and controlled to be reduced by reducing the flow of the magnetic flux due to the difference from the magnetizing force of the second electrode by the auxiliary magnet.
A reed switch control device. A ferromagnetic auxiliary magnetic pole body is disposed between the auxiliary magnet and the reed switch,
The magnetic force exerted by the auxiliary magnetic body on the second electrode of the reed switch is adjusted to a predetermined value by the auxiliary magnetic pole body.
The reed switch control device according to claim 2. The first reed switch and the second reed switch sandwich the first magnet and the second magnet from both sides in the y direction, and the electrode shaft of the first reed switch and the second reed switch Are arranged in parallel with the X axis,
Regarding the on / off driving of the first reed switch, the first magnet is a main magnet, the second magnet is an auxiliary magnet,
Regarding the on / off driving of the second reed switch, the second magnet is a main magnet, the first magnet is an auxiliary magnet,
The movement of the first reed switch and the main magnet with respect to the movement of the magnet pair composed of the first magnet and the second magnet, and the approach between the second reed switch and the main magnet And the separation action is reversed,
When the first reed switch is driven on or off, the second reed switch is driven off or on, respectively;
The reed switch control device according to claim 2 or 3, wherein A push button switch comprising the reed switch control device according to any one of claims 2 to 4,
As a means for moving at least the magnet pair of the first magnet and the second magnet, a push button provided so as to be able to protrude and retract with respect to the casing is provided.
A push button switch characterized by that.

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